JavaScript Code Viewer

What is JavaScript Code Viewer

Last reviewed: April 18, 2026

JavaScript is the programming language of the web, running in every modern browser and powering most interactive frontends and Node.js backends.

JavaScript Code Viewer is a quick-look pretty-printer for JS, TypeScript, JSX, and Node snippets. It re-indents your code with balanced braces and renders it with syntax highlighting.

Nothing is uploaded — the tool runs entirely in the browser so it works well even with proprietary code.

Why use it

• Review minified or mangled JS on the fly.
• Re-indent code copied from logs or chat.
• Share readable snippets with teammates.
• Audit bundler output or codegen.
• Teach JS with clean examples.

Features

• Brace-aware re-indentation
• JS syntax highlighting
• Works with JS, TS, JSX
• JS/TS parsed locally in your browser
• Fast copy-paste

How to use JavaScript Code Viewer

1. Paste JS / TS. Drop any JS-like source into the viewer.
2. Click Run. Output is re-indented and highlighted.
3. Copy result. Paste into your doc or review.

Example (before/after)

function greet(n){console.log("Hi "+n);}greet("Ada");

function greet(n) {
  console.log("Hi " + n);
}
greet("Ada");

Common errors

FAQ

Related tools

Pair with JavaScript Beautifier, escape/unescape, and regex tester. You can also browse the full Viewers category for more options.